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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>变量内存结构</title>
    <script>
        /* 
            变量中并不存储任何值，而是存储的内存地址！
        */
    </script>
</head>
<body>
    
</body>
</html>